Article
Guidelines for case classification for the National Birth Defects Prevention Study.
Birth defects research. Part A, Clinical and molecular teratology - 1 Mar 2003
Rasmussen Sonja A, Olney Richard S, Holmes Lewis B, Lin Angela E, Keppler-Noreuil Kim M, Moore Cynthia A
Abstract excerpt
BACKGROUND: Previous studies have suggested that etiologic heterogeneity may complicate epidemiologic analyses designed to identify risk factors for birth defects. Case classification uses knowledge of embryologic and pathogenetic mechanisms to make case groups more homogeneous and is important t...
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